我需要以编程方式在Android设备中打开蓝牙并等到它继续进行下一行代码.

我的代码如下

if (!mBluetoothAdapter.isEnabled()) {

Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

ctx.startActivity(enableBtIntent);

}

当这样做时,代码继续从nect行执行,而不必完全等待蓝牙.有什么方法可以解决这个问题吗？我可以添加外观来检查蓝牙是否已打开？

解决方法:

您可以注册BroadcastReceiver以侦听BluetoothAdapter上的状态更改.

首先创建一个将侦听状态更改的BroadcastReceiver

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

final String action = intent.getAction();

if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {

final int bluetoothState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,

BluetoothAdapter.ERROR);

switch (bluetoothState) {

case BluetoothAdapter.STATE_ON:

//Bluethooth is on, now you can perform your tasks

break;

}

}

}

};

然后在创建时使用您的Activity注册BroadcastReceiver,以便它可以开始接收事件.

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//Set a filter to only receive bluetooth state changed events.

IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);

registerReceiver(mReceiver, filter);

}

记住在销毁Activity时取消注册侦听器.

@Override

public void onDestroy() {

super.onDestroy();

unregisterReceiver(mReceiver);

}

标签：android,android-bluetooth

来源： https://codeday.me/bug/20190716/1475360.html